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Complete Photoionization Experiments via Ultrafast Coherent Control with Polarization Multiplexing

机译:通过超快速相干控制和极化多路复用完成光电离实验

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摘要

Photoelectron angular distributions (PADs) obtained from ionization of potassium atoms using moderately intense femtosecond IR fields (~10~(12) W cm~(-2)) of various polarization states are shown to provide a route to "complete" photoionization experiments. Ionization occurs by a net three-photon absorption process, driven via the 4s → 4p resonance at the one-photon level. A theoretical treatment incorporating the intrapulse electronic dynamics allows for a full set of ionization matrix elements to be extracted from 2D imaging data. 3D PADs generated from the extracted matrix elements are also compared to experimental, tomographically reconstructed, 3D photoelectron distributions, providing a sensitive test of their validity. Finally, application of the determined matrix elements to ionization via more complex, polarization-shaped, pulses is demonstrated, illustrating the utility of this methodology towards detailed understanding of complex ionization control schemes and suggesting the utility of such "multiplexed" intrapulse processes as powerful tools for measurement.
机译:使用不同偏振态的中等强度飞秒IR场(〜10〜(12)W cm〜(-2))从钾原子的电离获得的光电子角分布(PAD)显示出为“完全”光电离实验提供了一条途径。电离是通过净三光子吸收过程发生的,该过程由单光子级的4s→4p共振驱动。结合了脉冲内电子动力学的理论处理可以从2D成像数据中提取全套电离矩阵元素。还将从提取的矩阵元素生成的3D PAD与通过层析成像重建的3D光电子实验分布进行比较,从而对其有效性进行敏感测试。最后,演示了将确定的矩阵元素应用于通过更复杂,极化形状的脉冲进行电离的过程,从而说明了该方法对于详细理解复杂电离控制方案的实用性,并暗示了这种“多重”脉冲内过程作为强大工具的实用性用于测量。

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